As we discuss before.
I need Xamarin Android application that will popup with window on each call.
User will be able to click button to accept/decline call.
You will need provide sources.
Please put "I have sources" at start of your bid.
PS: If you have same for iPhone and Windows Phone - I will buy these too.
I need only stable prove of concept.
Does not need publish in Google Play.
Does not need beauty UI.
When incoming call coming app must show to user custom UI form with accept/reject.
Default system window must NOT appear. Only one popup on incoming call.